Hey there! Since you're new to Azure Web Apps for Linux with Python Flask, let's break down each of your questions clearly:

Azure's Linux-based Python runtime is set up to automatically look for a requirements.txt file in the root directory of your deployed application. Since you already generated this file using pip freeze (which captures all your local dependencies like Flask-Mail), the platform will spot it right away during the deployment process. Just make sure the file is placed at the root of your project folder—not buried in a subdirectory—so Azure can find it easily.

Absolutely! You don't have to lift a finger for this. When you deploy your app, Azure runs the command pip install -r requirements.txt behind the scenes as part of its build pipeline. This will pull down and install all the packages listed in your requirements file directly on the Linux server. A quick note: double-check that your package versions are compatible with Linux (most are, but some might have system-level prerequisites). If something goes wrong, you can check the deployment logs in the Azure Portal to debug.

Nope, you don't need to do this manually. The automatic build process takes care of installing all dependencies for you. That said, if you ever hit a snag (like a package failing to install), you can use the Azure Portal's Advanced Tools (Kudu) to access the server's terminal and run pip install commands yourself—but this should be a troubleshooting step, not a standard part of deployment.

Absolutely! Azure CLI is a fully supported, widely used method for deploying Python Flask apps to Azure Web Apps. It's super flexible—you can use commands like az webapp up (which can even create the Web App resource and deploy your code in one go if you haven't set it up yet) or configure local Git deployment with az deployment source config-local-git. It fits right into local development workflows and can even be used in automation scripts. Just remember to log into your Azure account first with az login, and select the correct subscription if you have multiple ones.

内容的提问来源于stack exchange，提问作者Debartha Mitra